Abstract
Total and differential cross sections for excitation are calculated using three distorted-wave methods: the continuum distorted-wave (CDW) method, the Coulomb peaking impulse approximation (CPIA) and the symmetric eikonal (SE) method. All three methods have the correct Coulomb asymptotic behaviour on both channels. Results for proton-hydrogen excitation to levels n=2, 3 and 4 are presented. Differential cross sections are also calculated and compared with experimental results. The CDW method is found to present a doubtful enhancement that vanishes at high projectile velocities. The dependence of the excitation process on the projectile Coulomb charge is also studied. Cross sections for single excitation of Fe24+ by impact of bare and neutral projectiles are calculated and compared with recent experiments.
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